Meeting minutes
Date: 15/04/2025
Attendees: @rbeucher , @Aidan , @clairecarouge , @RachelLaw , @MartinDix , @tiloz , @inh599 , @pearseb , @dhb599 , @dougiesquire , @manodeep , @micael , @spencerwong , @paulleopardi , @Jhan
New spinup analysis
Ian showed first results:
- Ocean temperature is falling due to the solar constant, need more time to reach equilibrium.
- Salinity: New exe has change the salinity trend from slight decrease to slight increase.
lprecvalue also changes the trend in the salinity as expected. - Surface energy and water balance just as good as before.
- TOA balance too high at the moment because the ocean is still not at equilibrium. The land is also producing a -.3 imbalance which will stay.
Ian: Should the run with lprec=0 be continued knowing it is creating an increasing salinity? Probably having a non-zero value is ok because the model will never perfectly conserve water and this parameter compensates for that.
Tilo: Let’s continue both runs for another 100 years. No harm in letting it run for another week. Agrees that using a non-zero value for this parameter could be justified.
Pearse: The ocean primary production is too high now. To investigate and start running some tests to adjust the production. Question on where to find the configuration.
Spencer: Added links in the chat to the configuration and how to clone it with payu.
Ian: Should the previous spinup be continued?
Ian: It’s not essential at this time. Tilo: happy to move on and continue with the current configuration.
Timing for starting the production runs
Claire: When would we need to freeze the model and the configurations so that we have enough time for the spin up to equilibrate before starting the production runs?
Tilo: The plan is still to start production runs from as early as possible in the next quarter. We want to run as many configurations as possible in parallel: PI-control, 1%, 4xCO2. From now on, changes should be fine tuning than big changes.
Ian: Over the next 2 months, we should check all the capabilities we will want to use are tested and assess (landuse change, emission driven…).
Rachel: We need to run other configurations to check the behaviour of the model under other conditions. It would be good to reassess the timeline considering we now know the runtime for the model.
Paul: it would be good to have dates forcing will be needed by so that it’s easier to plan the work.
Next meeting
22nd April.